Receiving circuit



26 1927. Apnl 7 L D. KELLOGG RECEIVING cmcurr Filed on. e. 1922 PatentedApr. 26, 1927.

UNITED STATES PATENT OFFICE.

LEROY D. KELLOGG, OF DEER/FIELD, ILLINOIS, ASSIGNOR TO KELLOGGSWITCHBOARD AND SUPPLY COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OFILLINOIS.

RECEIVING CIRCUIT.

Application filed October 6, 1922. Serial No. 592,681.

My invention relates to wireless telephony and has to do, in the form inwhich I have elected to show and describe it, more particularly withreceiving circuits for such systems, its object being to produce bycertain circuit arrangements sharpness and clearness of signals whilemaintaining satisfactory volume unimpaired.

In the accompanying drawing, I have shown my invention in associationwith a conventionally diagrammed system of wellknown character,involving at B and C radio frequency amplification; at I) the elementsmore particularly involved in the present invention are shown organizedin a preferred manner, while at E one additional stage of amplificationis provided.

Referring more particularly 'to the apparatus at D, the incomingoscillations, after being amplified by the agencies of the tubes 13 andC and transformer b, are received upon the primary 1 of thevario-coupler c, the usual taps 2, switch lever 3 and variablecondensers 8 being provided and connected up for tuning purposes, all inthe wellknown manner.

The incoming oscillations are translated to the secondary 4 of thevario-coupler and at tube D the plate circuit is connected back throughthe primary 12 of transformer (Z and the plate battery 15 to apointbetween the secondary winding of the tuned receiving device 0 and theusual grid condenser 9, the latter provided with the usual grid leak 8.At this point the oscillations in the plate circuit divide, a portionreturning to the filament via winding 4:, while the energy of theremaining part is impressed upon the audion circuits via the variablecondenser .10 and grid condenser 9, resulting in an appreciable benefitin the sharpness with which the incoming signals are reproduced at thetransformer 03, where they are translated to the tube E and amplified alast time for the audible receiving device F.

What I claim as new and desire to secure by United States LettersPatent, is:

1. A receiving circuit for high frequency oscillations including atranslating device, a receiving tube with filament, grid and plate, saidtranslating device having one terminal connected to filament and theother to grid, a conductor connecting the plate to a point between thegrid and that terminal of the translating device connected thereto, saidplate connected to said filament, through said terminals in series, anda battery, the said conductor connecting said plate to the point betweenthe grid and that terminal of the translating device connected theretoincluding bet-ween the plate and the said point of connection to saidgrid circuit, a winding of a translating device and said battery inseries.

2. A receiving circuit for high frequency oscillations including a tunedcircuit upon which the oscillations are impressed, a tube with filament,grid and plate,'said filament connected to one terminal of said circuitand said grid connected to another terminal thereof, and a conductorleading from the plate and connected to the conductor leading from saidgrid to said other terminal and operatively connected to said filamentonly through the terminals of said circuit in series, said conductorincluding between the point that it is connected to said plate and tothe grid circuit a translating winding and a source of potential.

3. In a radio circuit, the combination with a tube provided withfilament, grid and plate, of a coil, a circuit for said coil having oneterminal to grid and the other to filament, a plate battery having itspositive terminal to plate and its negative terminal conductivelvconnected between said one terminal of said coil and said grid, andasingle path for current from said negative battery terminal through saidcoil terminals to said filament.

41:. In a radio circuit, the combination with a tube provided withfilament and plate, of a receiving device having a winding and oneterminal thereof connected to filament, a plate battery and a conductivepath for current from said battery including said plate, said filamentand said winding of said translating device upon which the receivedoscillations are received for transmission to said tube, said conductivepath being the only path from said plate to said filament and extendingdirectly from said plate through a translating device and said platebattery to the grid circuit.

Signed by me at Chica o, in the county of Cook, and State of Illiniiis,this 4th day of October, 1922.

LEROY D. KELLOGG.

